animal cell nonhuman 150 protein expression Animals 138 priority journal 130 controlled study 128 signal transduction 128 article 120 mouse 94 Mice 84 Signal Transduction 78 animal experiment 62 Humans 60 human 60 unclassified drug 60 animal 58 metabolism 56 Female 50 animal tissue 50 female 46 messenger RNA 46 human cell 44 animal model 40 enzyme activation 40 rat 40 cell proliferation 38 protein function 38 mitogen activated protein kinase 1 34 mitogen activated protein kinase 3 34 Rats 32